109 The mass, from which the gallic acid was dissolved out [102] will be found to contain ellagic acid (C 7 H0 3 +HO+A).

It may be obtained, by digesting w T ith potash, and precipitating with hydrochloric acid.

It is one of the constituents of the bezoar stones of India, the intestinal concretions of certain ani- mals.

Gallic acid but not ellagic acid heated with oil of vitriol, gives, on cooling, parellagic acid.

It is in the form of dark crystals : and has the same constitution as ellagic acid.